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What is 12 + 8?
Grade Level:
Class 1
Maths, Computing, AI
Definition
What is it?
12 + 8 means combining the number 12 with the number 8 to find their total sum. It is a basic addition problem where we count forward from 12 by 8 steps.
Simple Example
Quick Example
Imagine you have 12 ladoos in one box and your friend gives you 8 more ladoos. To find out how many ladoos you have in total, you would add 12 and 8. The total number of ladoos would be 20.
Worked Example
Step-by-Step
Let's find the sum of 12 + 8.
1. Start with the first number, which is 12.
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2. We need to add 8 to it. Think of counting forward 8 steps from 12.
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3. You can count on your fingers or in your mind: 12 (start), then 13, 14, 15, 16, 17, 18, 19, 20.
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4. Alternatively, you can break down 8. To reach the next '10' from 12, you need 8. So, 12 + 8 = 20.
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5. Another way is to add the ones digits first: 2 (from 12) + 8 (from 8) = 10.
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6. Now add the tens digit from 12 (which is 10) to the 10 you just got: 10 + 10 = 20.
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So, 12 + 8 = 20.
Why It Matters
Understanding addition is fundamental for computing and AI, as computers constantly perform calculations. In real life, it's used by engineers to design buildings, by scientists to analyze data, and by financial analysts to manage money.
Common Mistakes
MISTAKE: Counting backward instead of forward, leading to a smaller number. | CORRECTION: Always count forward when adding. For 12 + 8, start at 12 and count up 8 times.
MISTAKE: Forgetting to carry over when adding digits if the sum of ones digits is 10 or more (though not directly applicable to 12+8 as 2+8=10). | CORRECTION: When adding larger numbers, if the sum of the ones column is 10 or more, write down the ones digit and carry over the tens digit to the tens column.
MISTAKE: Mixing up addition with subtraction. | CORRECTION: Remember that '+' means 'put together' or 'find the total', while '-' means 'take away' or 'find the difference'.
Practice Questions
Try It Yourself
QUESTION: A bus had 15 passengers. 5 more passengers got on. How many passengers are there now? | ANSWER: 20
QUESTION: You saved 18 rupees. Your mother gave you 7 more rupees. How much money do you have in total? | ANSWER: 25 rupees
QUESTION: Riya had 25 storybooks. Her brother gave her 5 new books, and then her friend loaned her 3 more. How many books does Riya have now? | ANSWER: 33 books
MCQ
Quick Quiz
What is the sum of 12 and 8?
18
20
22
10
The Correct Answer Is:
B
When you add 12 and 8 together, you are combining them. Counting 8 steps forward from 12 gives you 20. Options A, C, and D are incorrect sums.
Real World Connection
In the Real World
When you are shopping at a local kirana store, and you buy a packet of biscuits for 12 rupees and a cold drink for 8 rupees, you quickly add 12 + 8 in your mind to know you need to pay 20 rupees to the shopkeeper. This quick mental math helps in daily transactions, even with digital payments like UPI.
Key Vocabulary
Key Terms
ADDITION: The process of combining numbers to find their total sum | SUM: The result obtained when two or more numbers are added together | TOTAL: The complete amount or number of something | COUNTING ON: A strategy for addition where you start from one number and count forward the value of the other number.
What's Next
What to Learn Next
Great job with basic addition! Next, you can explore adding larger numbers, or learn about subtraction. Subtraction is the opposite of addition and will help you find differences between numbers.
